An atom has a mass number of 37 and atomic number 17. How many protons does it have?

An atom has a mass number of 37 and atomic number 17. How many protons does it have?

Q. An atom has a mass number of 37 and atomic number 17. How many protons does it have?

A.            20

B.            54

C.            17

D.            21

Answer: 17

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